Process for the manufacture of the condensation products of urea and of formaldehyde



Patented Oct. 18, 1927.

UNITED STATES. PATENT OFFICE.

HENRI nnnrnnnnmr, or rams, FRANCE,

. mas MATIERES PLASTIQUES, or rams, FRANCE assrenon To run soomrn mnosrnmnm:

PROCESS FOR THE MANUFACTURE OF THE CONDENSATION PRODUCTS UREA AND OF FORMALDEHYDE.

No Drawing. Application filed November 23, 1925,

The known methods provide for the production of the two methylol ureas;

NH: and

NH- (3111- OH barium hydroxide, while introducing into the mass a current of carbon dioxide after the reaction has been set up, in order to destroy the action of the base.

The present invention consists in the use of natural carbonate of calcium which is ground to an'impalpable powder, and in the use of precipitated and washed calcium carbonate, magnesium carbonate and the alkali earth carbonates in general, which are pre pared in like conditions and for the same purpose. It has been found that when the 1 solutions are brought to the boiling point, asmall amount of carbon dioxide will be disengaged, while at the same time the condensation takes place between the resulting methylol-ureas, with elimination of water. Herein it is to be supposed that a con: densation of lactonic form takes place, this condensation being quite analogous to what is afforded by saligenin. As a result there is obtained a new compound having a very large molecule, which is soluble in water and is to be classed as to its general properties among the lyophile colloids, that is,.a colloid which tends to remain dispersed, hold water or remain ,in solution; such colloids being reversible or irreversible according to the acidity or the P of the environment in which they are found. 7

It is known in fact that the properties of 40 such colloids depend entirel upon the P of their'solutions. But it asbeen found that in conditions of tem erature"and also.

/ of hydration which have een suitably predetermined by the evaporation of a known quantity ofsolvent, the new complex body Serial No. 70,998, and in France December 16, 1924.

versible at 120 F. for a value of P between 1 and 4.

Pu Corresponding .6

concentration in H-ions. 8.6 3.98

(Berichte dcr Deutsche Chemische GeselL' shaft, v. 41, pp. 24-27) Goldschmidt (Chem.

Cent. B1. 1897, pp. 11, 194, 737)., (Chem. z.

21,460, -D'. R. P- 97,164) and (Schweiz. Chem. Ztg. 1924, pp. 240-242). a

The said mass when in the dry state can be, cut into shape, milled or filed, and can be polished with facility. It can be em- .ployed for the manufacture of various objects of a transparent or translucent nature, according to the final chemical state of the environment, such objects resemblin the products of condensation of phone and formaldehyde, but being superior to the lat ter from the fact that they are colourless and that: their aspect cannot be changed by the action of 'li ht and heat.

The said pr uct may have added thereto 1 considerable amounts of organic or inorganic substancesduring its manufacture, in

order to change its properties or to reduce the cost. For instance, the addition of coloring agents or pigments permits various shades and. difiererit surface appearances or corresponding feart hours; it is then boiled for 4 hours.

filtering;}I obtain a sirup'which may be. more or less concentrated in vaouo, and the IOSIIRIS either an amorpho is dry extract whichis hygroscopic and soluble in water; or a. thicl; gum having the consistency ofmucilage. I'lmay change the P of said 'gummysolution by the use of a well proportioned acid ajildetermined P value, ::-'whereby the new colloid body will be; spontaneousl transformed'into an irreversible colloid y heat- A process of manufacturing condensa- .in' to some 195 F.; a tampon solution mg a solution of a weak acid and a salt thereof; or a'weak base and a salt of the J'For tlie' production of the moulded and. Eolished obpcts; the *operation is performed the use-0f. molds of'metal, glass or like 'd andnon porous material. clalm i earth carbonat -.to

Hon products from urea and formaldehyde,

solution-" such as hydrochloric known tamponsolutionhaving syrup -thereb v trating the fil t tion products from urea.a nd formaldeh do,

comprising the ste s; m toge er urea and .fprmalde j addifi'g f'janalkali I th'e'"'mi'x"tu're;= and then the resultant reaction mixture.

comprising the steps of mixing to ether urea and formaldehyde; adding an a kali earth carbonate 'to v the mixture; allowing the resultant reaction mixture to stand-for a time; and then boiling saidreatttion mixture.-

- 3. A process according to claim 2, in which the reaction mixture istallowed to stand for 4 hours and then' boiled for. 4 hours.

4. A process .ofmanufacturing condensa- 'tion products from urea and formaldehyde, comprising the steps of mixing to ether urea and formaldehyde; adding an a kali earth carbonate to .the mixture; allowing the .re-

sultant reaction mixture to stand for a time;

boiling said reaction mixture; and then concentrating in vacuo the syrup obtained after the boiling step.

5. A process of manufacturing condensaprocess of manufacturin'gfcondensac tion products from urea and formaldehyde, 4

comprising the stpsof mixing to other urea ancl' formaldehyde; adding, an a ali earth carbonate to the mixture; allowing the re-' sultant reaction mixture 'to sta'ridfora time;

boiling said.reactio'n mixture; filtering the obtained; and then 'concen-. ered syrup in vacuo. Si ned at Paris,- in the county of Seine and @tate of France; this 5th day of-Novems "ber'A; D. 1925.

HENRI BARTHELEMY; 

